Severe thunderstorm watches are issued when atmospheric conditions are favourable for the development of thunderstorms that could produce one or more of the following: large hail, damaging winds, torrential rainfall.

On Saturday, tornado warnings were in effect as storms passed through the London, Toronto and Durham regions.

Environment Canada said it was tracking severe thunderstorms capable of producing very strong wind gusts, up to nickel-size hail and heavy rain.

A lot of people posted pictures of ominous looking cloud formations on social media, but there were no reports of any funnel clouds.